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Variant Discovery in High-Throughput Sequencing Data

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Developed in the Data Sciences Platform at the Broad Institute, the toolkit offers a wide variety of tools with a primary focus on variant discovery and genotyping. Its powerful processing engine and high-performance computing features make it capable of taking on projects of any size. Learn more

Somatic variants lost when --genotype-germline-sites true

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    Gökalp Çelik

    Hi Jaime Alvarez Benayas

    My first pick is on that interval parameter which definitely affects the way local assembly and realignment. 

    Can you try adding more padding to those intervals by using parameter  -ip ?

    We recommend adding preferably around 150 to 250 basepair padding for all intervals. In fact you might also try running it without the interval parameter to see if you observe the same issue. Intervals limit the amount of reference genome and read content involved in generating the local assembly therefore detected variants may still be affected undeterministically (albeit a small fraction). 

    I hope this helps. 

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    Luka Culibrk

    Is the issue that the variant is emitted but filtered with --genotype-germline-sites, but it is PASS otherwise? I don't know the filter applied in your case, but I noted some months ago that if you emit more variants (e.g. by --genotype-germline-sites), the clustered_mutations filter starts going to work and filtering out some high quality somatic variants. If this is your issue, I believe the fix was implemented in 4.6.0.0, released in June.

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    Gökalp Çelik

    This particular PR is the one you are talking about I suppose. This could be the solution as well. Thanks for pointing out. 

    https://github.com/broadinstitute/gatk/pull/8717

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